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Healing a battle-scarred mind

Scientists went searching for the causes of post traumatic stress disorder and came back with an unlikely answer: the immune system. Brett Szmajda reports.

Predicting which soldiers will develop PTSD has  so far proved impossible. The disorder affects one in 10 combatants.
Predicting which soldiers will develop PTSD has so far proved impossible. The disorder affects one in 10 combatants.